Blue trisazo dye and process of making same.



UNTTED STaTns PATENT @FHCE, 1

MELCI'IIOR BQNIGER AND JAN LAGUTT, OF BASLE, SlVITZERLAND, ASSIGN ORS TO CHEMISGHE FABRIK, VORMALS SANDOZ, OF SAME I-LACE.

BLUE TRISAZO DYE AND PRQCESS fOF MAKENG SAMEQ SPECIFICATION forming part of Letters Patent No. 652,456, dated June 26, 1906.

erial No. 728,058. (Specimens) Toall whom it 17mg concern:

Be it known that we,'MnLcte1on Benzene and JAN LAGUTT; doctors of philosophy, chemists, residing at Basle, Switzerland, have 5 invented new and useful Improvements in the Manufacture of Blue Trisazo Dyes, (for which patents have been applied for in Germany on April 12,1899, No. C. 8,188, IV/22; in Great Britain on April 22, 1899, No. 8,503,

to and in France onAprillS, 1899, No. 287,971,) of which the following is a specification. Our invention relates to the production of new trisazo dyestuffs dyeing nmnordanted cotton in greenish-blue to dark blue shades fast to alkalies. These new coloring-matters are produced by combining in an alkaline solution one molecule of a tetrazotized para- (lltllllll. with one molecule of the monoazo dye formed by coupling in a mineral-acid solution the diaaodichlorbenzene 1.2.4 or 1.2.5 or 1.3.4: with 1.8 amidonaphtol 3.6 disulfonic acid to a so-callec intermediate product and coupling the intermediate product thus obtained in an alkaline soluti with one molecule of suit-able amidoneg suitonic acid--such as 1.8.4.01 2.8.6amidonaphtolsulfonic acid, 1.8.8.6 or 1.8.4.6 or 1.5 It amidonaphtoldi sullonic acid. The dyestuffs thus obtained are alkaline salts of acids having the general foru'iula P representingthe radical of the paradiaminsuch as diphenyl, ditelyl, diinethoxydiphenyl, or thelike, and it the amidonaphiolsulfonic acid.

In carrying out our process practically we proceed as follows: 31.1 kilos of the acid so dium salt of 1.8 amidonaphtol 3.6 disulfonie acid {one hundred per t; are dissolved in about fenr hundred liter. of Waterconiai 5 five kilos of sodium bonate and are tl n precipitated in a fine i lded state by the addition ofthirtykil of inuriatic acid iiaume. The line yalivideti pas-Le ti obtained is then combined with the di 5o coniponnd prepared by diazotiaing with 6.9 kilos of sodium nitrite, an ice-cold seiution of16.25 kilos of dichloranilin (NH Cl Cl: 1 t 2 Z 5) in three hundred liters of diluted muriatic acid of 7.3 per cent. The combination is finished Within about twelve hours, when by the well-known tests neither free diazo compound nor nncombined amidonaphtclsulfonic acid can any more be detected. The red-brown acid paste of this monoazo dye is then mixed with the tetrazo-diphenyl solution obtained in the wellknown manner from 18.4 kilos of benzidin, and the rcsultingmixtnre, thoroughly stirred up, is afterward poured slowly into an ice-cold solution of eighty kilos of sodium carbonate in eight hundred liters of Water. The combination begins once, and after stirring for about one hour the black precipitate of the intermediate product thus obtained is then combined with. the solution oi" 3&1 kilosioi'j 1.8 ainidonaphtol 5 disuli'onic acid (one hundred per cent. acid sodium salt) in four hundred liters of water and four kilos of caustic soda. By stirring ifrom time to time the combinaticn is ccnipieted within about twentyhourm The darh biue rather gelatinous mass is then heated up to boiling and the coloring-matter salted out in the heat by addition of twenty kilos of common salt, filtered and dried. In this example the 1.8 arnidonaphtol, 3.6 di--'8o sultonic acid used as second component may be replaced by equivalent weights of other suitable ainidonaphtolsulfonic acids, such as or 1.8.5 or 2.8.6 amidonaphtolmonosulfcnic acid or 1.8.2.4- or 1. 8.3.5 or 1.8.-i. 3 amidenaphtoldisulfonic acid. It may also be stated that the dichloraniliu 1.2.5 can be substituted by the isomeric 1.2.4 or 1.3.4 dichlorauilin and the benzidin by other paradia-niins, as tolidin, dianisidin, ethoxybenaidin, emd thelike. The new trisazo dyes thus formed represent dark powders with a bronze like luster, easily soluble with blue coior in water, inethylic alcohol and also in strong sulfuric acid. Reducing agei1ts-a;-i, for in stance, rained ask-in presence of ia-lye destroy the blue color, and by beiii I less seluiit thus obtained the strong at i. at the dichlorai with. steam i be observed. Cihencu'tri .0 color yields on nnmordan cotton in a neutral or siightlyalhaline bath and also'on wool and silk in a neutral or acid bath inpresence of 'Glauber-salt or common salt greenish-blue to dark-blue shades.

Now what we claim, and desire to secure by Letters Patent,'is the following:

1. Theprocess for the production of newblue trisazo d'yestu Es whichconsists in combining inan alkaline solution to a so-called intermediate productone molecule of a tetrazotized paradiamin with one molecule of I the monoazo dye, resulting from the combination in an acid solution of one moleculediazodichlorbenzene with one moleculeLS- amidonaphtol 3. 6 disulfonic acid and coupling the intermediate product thus obtained with one molecule ofan amidonaphtolsulfonic acid;- sub'stantiall-y as set'forth.

7 2. As a new article of manufacture a newbl-ue'trisazo dye derived from'one molecule of a'tetrazotized baradiamin, one molecule of 2c the m-onoa-zo dye dichlorbenzeueazo 1. 8 amidonaphtol 3.6 disulfonic acid and one molecule of an amidonaphtolsulfonic acid, representing dark powders with bronze luster, dissolving in water, methylic alcohol, and strong sulfuric acid with blue color,regenerating by reduction with zinc-dust and soda-lye clichloranilin and dyeing .u'nmordanted cotton is blue shades, substantially as set forth.

In testimony whereof we have signed our 0 two subscribing. witnesses.

MELOHIOR BONIGER. JAN LAGUTT. A

names to this specification-in the presence of 

